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<br />-? ':-., \- ~j <br />t'VJ <br /> <br />Article II(2) of the Criteria for Coordinated Long-Range Operation of <br />Colorado River Reservoirs, promulgated by the Secretary of Interior in June <br />1970, states that ,,,hen Lake Powell active storage is less than Lake Mead <br />active storage, then the objective shall be to maintain a minimum release <br />from Lake Powell of $.23 million acre-feet for that year. Lake Powell <br />active storage was less than L~(e Mead active storage during the 1976-77 <br />water year, and the flow at Lee Ferry, consisting of Lake Powell releases <br />plus Paria River inflows assumed to average 20,000 acre-feet a year, con- <br />formed to the Operating Criteria by slightly exceeding the specified release. <br /> <br />Operating statistics of the river for the ~Iater year 1976-77 are <br />presented in Tables 1 through 6. These follow ,nth accompanying discussions. <br /> <br />Table 1 shows the measured flow at key stations. The first three <br />stations listed in Table 1 represent over 90 percent of the ,flow into Lake <br />PO\"lell. As has been the case for a number of years, flous belou Davis Dam <br />uere limited to meeting the consumptive use requirements of the United States <br />and the Uexican Water Treaty delivery requirements. <br /> <br />TABLE 1 <br /> <br />MEASURED FLO\'l IN COLORADO RIVER AND <br />TRIBUTARIES FOR WATER YEAR 1976-77 <br />(Thousands of Acre-feet) <br /> <br />Station <br /> <br />Me asured Flow <br /> <br />Upper Basin <br /> <br />Green River at Green River, Utah <br />Colorado River near Cisco, Utah <br />San Juan River near Bluff, Ut~1 <br />Colorado River at Lee Ferry <br /> <br />Lower Basin - Colorado River <br /> <br />2,764 <br />1,$73 <br />5$4 <br />$,2$1 <br /> <br />Near Grand Canyon <br />Below Davis Dam <br />Below Parker Dam <br />At Northerly International Boundary <br />above Morelos Dam <br /> <br />8,514 <br />8,058 <br />6,718 <br /> <br />1,514* <br /> <br />*For Calendar Year 1977, the flou at the Northerly Inter- <br />national Boundary \^las 1, ~.69, 000 acre-feet and was part of the <br />1944 /lIexican Hater Treaty minimum obligation of 1,500,000 acre- <br />feet annually. Additional deliveries to r~xico during the 1977 <br />Calendar Year included 92,000 acre-feet delivered at the Southerly <br />International Boundary near San Luis, 9,000 acre-feet delivered <br />to the City of Tijuana through facilities in the United States, <br />and 207,000 acre-feet of irrigation drainage waters of the <br />[kIlton-Mohawk Irrigation and Drainage District discharged <br />below Morelos Dam, for a total delivery of 1,777,000 acre- <br />feet. <br /> <br />- 2 - <br />